insidianter
insĭdĭanter, adv. [insidior],
- craftily, artfully, insidiously: insidianter speculati (al. insidiantes), Just. 6, 6.
unus Wallicus vocatus M. †ininsidiater [(sic MS l. insidianter ] et felonice interfecit unum alterum
ut modicas caperet ~er aves(